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![]() Typically, when the symbol time period is greater than 10 times the RMS delay spread, no ISI equalizer is needed in the receiver. The ratio of RMS delay spread ( ) and symbol time duration ( ) quantifies the strength of intersymbol interference (ISI). Knowledge of the delay spread is essential in system design for determining the trade-off between the symbol rate of the system and the complexity of the equalizers at the receiver. Nevertheless, it is not an accurate representation of the real environment in which the mobile is destined to operate at. PDP is usually supplied as a table of values, obtained from empirical data and it serves as a guidance to system design. A sample power delay profile plot, shown in Figure 1, indicates how a transmitted pulse gets received at the receiver with different signal strengths as it travels through a multipath channel with different propagation delays. In a typical PDP plot, the signal power ( ) of each multipath is plotted against their respective propagation delays ( ). In a typical PDP plot, the signal power on each multipath is plotted against their respective propagation delays. ![]() Power delay profile (PDP)Ī multipath channel can be characterized in multiple ways for deterministic modeling and power delay profile (PDP) is one such measure. Power delay profile gives the signal power received on each multipath as a function of the propagation delays of the respective multipaths.
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